Which of the following elements has the electronic configuration 1s2 2s2 2p6 3s2

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Question: Which of the following elements has the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2?

Options:

Correct Answer: Ca

Solution:

Calcium (Ca) has an atomic number of 20, and its electronic configuration is 1s2 2s2 2p6 3s2 3p6 4s2.

Which of the following elements has the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2?

Which of the following elements has the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2?

Step 1: Understand that the electronic configuration describes how electrons are arranged in an atom.
Step 2: Break down the given electronic configuration: 1s2 2s2 2p6 3s2 3p6 4s2.
Step 3: Count the total number of electrons from the configuration: 2 (from 1s) + 2 (from 2s) + 6 (from 2p) + 2 (from 3s) + 6 (from 3p) + 2 (from 4s) = 20 electrons.
Step 4: The number of electrons in a neutral atom is equal to its atomic number. Therefore, the atomic number is 20.
Step 5: Look up the element with atomic number 20 on the periodic table. It is Calcium (Ca).
Step 6: Confirm that the electronic configuration for Calcium is indeed 1s2 2s2 2p6 3s2 3p6 4s2.

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